Use a better schema

[christianbundy]

Currently the schema is painful:

{
    "_id" : "SgSKbAh85aMvhXTX3",
    "sx6MWih3gBDqwRvuP" : {
        "okjJXyD8gWbSbdWQ7" : {
            "time" : ISODate("2014-03-17T20:56:26.022Z"),
            "rate" : "4"
        }
    }
}

Whereas it could be something like:

{
    "_id" : "SgSKbAh85aMvhXTX3",
    "user" : "sh5uWrsn7wTxwR2qg",
    "ratings" : {
        "9pACeuqeMWcWx3o6L" : {
            "time" : ISODate("2014-03-17T20:56:26.022Z"),
            "rate" : "4"
        }
    }
}